maxine wrote:
>
> Baking soda and hot water. I had a ponzu bottle with a narrow neck
> that would not come clean. Slid about a teaspoon of baking soda in,
> added hot water from the kettle, and shook. Magic. Clean as a
> whistle.

Bad advice. Baking soda should never be used to clean
glass because it can etch the glass by chemical attack.
Very slowly, but fast enough to cause damage you can see.